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