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