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