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