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