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