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