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