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