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