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