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