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)(17,18)(19,25)(20,28)(21,22)(23,27)(24,30)(26,31)(29,32)(6,8)(9,10,12,14)(11,13,16,15)(18,21)(23,25)(24,28)(31,32)(5,6)(7,8)(9,10)(11,13)(12,14)(15,16)(17,19)(18,23)(20,29)(21,25)(22,27)(24,32)(26,30)(28,31) involution — undirected(1,2,3,4)(17,20)(18,24)(19,26)(21,28)(22,30)(23,31)(25,32)(27,29)(9,11,12,16)(10,13,14,15)(17,21,22,18)(19,25,27,23)(20,28,30,24)(26,32,29,31)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.