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