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