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