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