One vertex per element, one color per generator, with an edge from x to x·s.
(2,3)(6,7)(17,18)(19,28)(20,30)(21,23)(22,32)(24,27)(25,31)(26,29) involution — undirected(1,2,5,3)(4,6,8,7)(9,10)(11,14)(12,15)(13,16)(17,19)(18,20)(21,32)(22,25)(23,29)(24,30)(26,31)(27,28)(9,11)(10,13)(12,16)(14,15)(17,20)(18,19)(21,29)(22,31)(23,32)(24,28)(25,26)(27,30) involution — undirected(1,3,5,2)(4,6,8,7)(9,11)(10,14)(12,16)(13,15)(17,21,24,31)(18,25,27,23)(19,26,30,32)(20,29,28,22)(17,22,24,29)(18,26,27,32)(19,25,30,23)(20,31,28,21)(1,4,5,8)(2,6,3,7)(9,10)(11,13)(12,15)(14,16)(17,23,24,25)(18,21,27,31)(19,29,30,22)(20,32,28,26)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.