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