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