Here's a useful list, that I found on the net.
G = Green (herbivore, social, religious)
B = Blue (omnivore, mixed, economic)
R = Red (carnivore, aggressive, military)
Bard - BBGR
Ecologist - GGBR
Zealot - GGRR
Diplomat - GGBB
Scientist - BBRR
Trader - BBBB
Shaman - GGGG
Warrior - RRRR
Wanderer - Start in space stage
Knight - RRBG
It also seems that the combination of the R/G/B can be in any order, so you might want to pick which stage you will get each color based on its other perks as well.
Also, three of any one color will give you Shaman/warrior/trader depending on the color.