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