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