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)(11,15)(12,14)(13,16)(17,18,22,20)(19,23,28,29)(21,24,31,30)(25,26,32,27)(1,3,6,2)(4,8,5,7)(9,11,12,16)(10,13,14,15)(17,19)(18,23)(20,29)(21,26)(22,28)(24,32)(25,30)(27,31)(10,14)(13,15)(17,20,22,18)(19,25,28,32)(21,24,31,30)(23,26,29,27)(1,4,6,5)(2,7,3,8)(10,14)(13,15)(1,5,6,4)(2,7,3,8)(11,16)(13,15)(19,26)(21,31)(23,32)(24,30)(25,29)(27,28)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.