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)(17,18,22,24)(19,25,27,32)(20,21,28,29)(23,30,31,26)(5,6)(7,8)(9,11,12,15)(10,13,14,16)(17,19,21,26,22,27,29,30)(18,23,20,25,24,31,28,32)(2,4)(6,8)(17,20,21,24,22,28,29,18)(19,25,26,31,27,32,30,23)(10,14)(13,16)(18,24)(20,28)(23,31)(25,32) 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.