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