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