It doesn't vary much. Green, yellow, and blue are standardize, they are always speakers, microphone, line in. Wikipedia has a nice list which corresponds well with the sound cards i have seen with Black, Grey, and Orange being your other 3 colors for rear, side, and center https://en.wikipedia.org/wiki/Sound_card#Color_codes
It doesn't vary much. Green, yellow, and blue are standardize, they are always speakers, microphone, line in. Wikipedia has a nice list which corresponds well with the sound cards i have seen with Black, Grey, and Orange being your other 3 colors for rear, side, and center https://en.wikipedia.org/wiki/Sound_card#Color_codes