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