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