I had to look this up, but that is not a grey/white scheme. It's the standard three color colors super faded and muted with dust and dirt.
I really had to look at that picture, but I'm confident it is not grey and white.
Replicating this look wouldn't be too hard. Just mute your colors and overspray with a dusty color. That should give you a good start for further weathering where the colors come out being faded just like in those pictures from the show.
If anyone else has a better opinion of this please correct me.