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