You need better lighting so that the color shows properly. You want direct sunlight when you enter the house so that you can see the color fully. There is no way to control this; you just have to keep entering and exiting the house until you get the lighting scenario that you want. I've found that going to different houses, waiting a few minutes, and/or restarting your game all help to get the best lighting scenario.
The lighting scenario you want is the one that
@SlowJRNalist has in his picture a couple of posts up.