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