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