This is my first attempt at creating a layout that would be logically easy to read by asking yourself what role you want to fill, what is needed by the team, which lane to go, to jungle or roam, etc.
Each role I designated with the large hero icons are as follows:
Invoker (Solo Mid Laners)
Anti-Mage (Hard Carries)
Spirit Breaker (Semi-carry gankers)
Chen (Lane support.) -- Yes I'm aware that Chen is actually a jungler, but
the presence he has in the easy lane to help support
a carry can't be denied.)
Naga Siren (Counter Initiator)
Wisp (Support -- usually supports that are viable to support a hard carry.)
Necrolyte (Hard nuker, able to solo the mid lane, or could be substitute to a support to permanently support a carry)
Sand King (Initiators)
Enigma (Initiator and pusher)
Broodmother (Pusher, solo laner)
Any feedback and constructive criticism is welcome via the comments. Would love to improve this concept.