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