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