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