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