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