One vertex per element, one color per generator, with an edge from x to x·s.
(2,3)(6,7)(10,12)(14,16)(17,18)(19,23)(20,25)(21,26)(22,27)(24,29)(28,30)(31,32) involution — undirected(1,2,5,3)(4,6,8,7)(11,15)(14,16)(17,19,22,29)(18,23,27,24)(20,26,30,32)(21,28,31,25)(9,10,13,12)(11,14,15,16)(17,19)(18,24)(20,26)(21,28)(22,29)(23,27)(25,31)(30,32)(1,2,5,3)(4,7,8,6)(9,11)(10,14)(12,16)(13,15)(17,19)(18,23)(20,26)(21,25)(22,29)(24,27)(28,31)(30,32)(1,3,5,2)(4,7,8,6)(9,12,13,10)(11,16,15,14)(17,20,22,30)(18,25,27,28)(19,26,29,32)(21,24,31,23)(1,4,5,8)(2,6,3,7)(17,21)(18,26)(19,28)(20,24)(22,31)(23,30)(25,29)(27,32)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.