Good idea! I am also using kind of pattern for deployment for visual satisfaction. It goes like this: Lights - without specific order, same goes for archers, slingers, barbarians and cavalry except heavy.
Auxillia - two rows but vertical (to keep the cohesion while moving
Medium and Heavy infantry - close ranks in solid block
Heavy cavalry -
(it is the elinistic style cavalry breakthrough)
Once some blocks are lost, I am always taking them from the back rows, trying to keep the front line intact, which is more reasonable than it seems, keeping in mind that it represents the cohesion lost.
We use figs !
More seriously, Light troops are with space in the hex (sorry for my bad formulation) and medium or heavy are more compact (less the warriors).
LI use only spears and javelines (sometimes green shields).
AUX use spears, swords and green shields.
Warriors are running figs (with blue).
Medium and heavy are more quiet figs (blue or red shields)
The same for the CAV.
Greetz from Le Mans