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