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