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