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