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