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