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