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