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