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