Currently you have to use a scene to turn a hue light on, dim it and turn it a color. Google Home cannot invoke a scene directly. It can only invoke Routines and SmartApps. In order to run a scene from google for the above, you have to create a routine to run the scene. The obvious answer is the make scenes compatible. Another solutions would be to allow chaning a light bulb color in a routine. Then you can just run the routine from google. SmartApps allow you to do the above but you have to assign those to a trigger.
Google Home can now invoke scenes directly.