This page contains information regarding Star Trek: Lower Decks, and thus may contain spoilers.
Its design consisted of a saucer section and a wide secondary hull positioned below and aft of the saucer between two elongated nacelles. The nacelles connected via pylons to the saucer, while separate pylons connected the secondary hull between them. The pylons contained turbolift access in their aft-most section. The navigational deflector dish was located on the forward face of the secondary hull. (LD: "Second Contact") The ship also carried an embarked Captain's yacht. (LD: "Terminal Provocations")
Two main shuttlebays were at the aft of and to either side on the saucer section, spanning Decks 5 and 6 with further room for shuttlecraft storage deeper into Deck 6. The ship carried a complement of at least five Type 6A shuttlecraft and had at least four Argo-type ground vehicle stored on Decks 5 and 7 adjacent to the shuttlebay. An additional shuttlebay was located aft and center of the engineering Secondary hull. This permitted engineering supplies, hazardous materials, and non-hazardous cargo to be separated from one another during shuttlecraft operations. The MSD also depicted several Type 8 shuttlecraft.
The primary crew quarters for lower-ranking members were barracks-style, with bunk beds lining the walls in a shared living space at the lower aft portion of the saucer section. This space, known as a residential hallway, also featured a large aft-facing viewing window overlooking the secondary hull. (LD: "Second Contact") Higher ranking crew members were afforded their own quarters. (LD: "Moist Vessel")
Per series showrunner Mike McMahan:
The ship is in great condition. It’s a California-class ship, which has always existed in Starfleet – [this is] what we’re saying – that they’re the utility support ships. In the California-class [line], there are three types of hull painting: there’s blue, red, and yellow.
We’ve extended the visual metaphor of the uniforms to the ships, and the Cerritos has yellow on the hull because it’s primarily a second contact engineering ship. They show up to planets that need engineering stuff done on them in order to be able to communicate with the Federation.
There’s also, you’ll see in the show, blue-hulled California-class ships, which are usually deployed to places where there has to be more medical expertise, and red-hulled ships that are like for moving around ambassadors and doing more command-level stuff. 
McMahan also stated that he was always a fan of the (Miranda-class) USS Reliant, and used that design mixed with the stylization of the (Galaxy-class) USS Enterprise-D as the visual inspiration for this class. (The Ready Room, "Premiere Special")
The class has three shuttlebays facing aft, two in the primary hull and one in the engineering module.