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