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