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