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