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