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