An unused image of the Talos IV surface prepared for "The Cage" showed the Pleiades very prominently in the Talos sky, the brightest stars enlarged to the size of suns.  It would seem that the image from "The Cage" would suggest that Talos IV was located in this cluster. (Star Trek Encyclopedia (4th ed., vol. 2, p. 171))
According to the Star Trek Encyclopedia (4th ed., vol. 2, p. 171), the Pleiades, also known as M45 or the Seven Sisters, was a region of space with young planets. It was a "cluster of about 400 stars in a 25-light-year radius, some 415 light years from Earth."