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