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