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