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