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