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