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