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)(19,28)(20,24)(21,26)(22,25)(23,27)(29,31)(30,32) involution — undirected(9,11)(10,13)(12,16)(14,15)(17,19,22,26)(18,21,25,28)(20,31,30,23)(24,27,32,29)(2,5)(6,8)(11,16)(13,15)(17,20,23,19,22,30,31,26)(18,24,27,28,25,32,29,21)(1,3,4,7)(2,6,5,8)(10,14)(13,15)(18,25)(21,28)(24,32)(27,29)(17,21,23,24,22,28,31,32)(18,26,27,20,25,19,29,30)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.