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