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