I find color distracting. I think that good IF writing should be compelling enough that people want to read everything and concise enough that people can read everything. If you’re trying to point out what’s changed in a scene, you should have the description be shorter the second time so the player can immediately see the new parts.
Besides, IIRC, you only get the basic 8 colors anyway, so there’s going to be absolutely no subtlety and little aesthetic value.