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