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