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