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