Calling a list of colors within a switch case for neopixel

I'm not exactly clear what you are asking/describing. Sounds like you may be using some programming terminology where it may not apply.

I think the answer is you make an array. Then you can access the array by using an index.

const uint32_t myColours[] = {
  strip.colour(123, 234, 34),
  strip.colour(56, 67, 78),
  ...
};