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