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