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)(17,18,21,24,23,28,22,27)(19,26,30,31,29,32,20,25)(2,5)(6,7)(9,11)(10,13)(12,16)(14,15)(18,24,28,27)(19,29)(20,30)(25,32,31,26)(11,16)(13,15)(17,19,22,20,23,29,21,30)(18,25,24,26,28,31,27,32)(1,3,4,8)(2,6,5,7)(10,14)(13,15)(17,20,22,29,23,30,21,19)(18,26,24,31,28,32,27,25)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.