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