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