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