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