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