Well the default UI orders party by reverse creation date (iirc). But I am sure you can break that up with a unit frame addon. Try Ag_Unitframes or PitBull or both. I use one or the other depending on what I am doing (raiding or not raiding) and I can not say if they break up the party or not. Both are ace addons and very user friendly.

GarbageFu also works for greys.



Edit: I need to type faster. My last night shift for a few weeks. Hoorah!