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