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