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