* Chao Drives are not visual objects: They are a gameplay mechanic, not something that has a physical appearance in the game.
* Their effect is on Chao: Chao Drives influence the stats, abilities, and appearance of Chao creatures.
* Their "color" is represented by icons: In the game, you'll see different icons associated with specific types of Chao Drives, like Power, Speed, and so on.
If you're thinking of something else, please let me know, and I'll do my best to help!