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