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)(19,20)(21,26)(22,27)(23,28)(24,25)(29,31)(30,32)(1,3,4,8)(2,5,6,7)(9,10)(11,14)(12,13)(15,16)(17,19,22,25,23,29,21,30)(18,24,26,20,28,32,27,31)(10,13)(14,16)(17,20,21,24,23,31,22,32)(18,25,27,19,28,30,26,29)(9,11)(10,14)(12,15)(13,16)(19,29)(20,31)(24,32)(25,30) involution — undirected(11,15)(14,16)(17,21,23,22)(18,26,28,27)(19,25,29,30)(20,24,31,32)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.