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