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