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