One vertex per element, one color per generator, with an edge from x to x·s.
(2,5)(6,7)(9,10)(11,13)(12,14)(15,16)(17,18)(19,26)(20,24)(21,25)(22,23)(27,31)(28,30)(29,32) involution — undirected(1,2,4,5)(3,7,8,6)(9,10)(11,15)(12,14)(13,16)(17,19,21,22)(18,23,25,26)(20,28,29,27)(24,31,32,30)(9,11)(10,13)(12,16)(14,15)(18,23)(19,22)(24,30)(25,26)(27,28)(31,32) involution — undirected(1,3,4,8)(2,6,5,7)(11,16)(13,15)(17,20,21,29)(18,24,25,32)(19,27,22,28)(23,30,26,31)(10,14)(13,15)(18,25)(20,29)(23,26)(27,28) 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.