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)(11,13)(12,14)(15,16)(17,18)(19,22,26,29)(20,23)(21,24)(25,28,31,32)(27,30)(1,3,4,8)(2,5,6,7)(9,11,12,15)(10,13,14,16)(20,27)(23,30)(25,31)(28,32)(10,14)(11,15)(17,19)(18,22,24,29)(20,25)(21,26)(23,28,30,32)(27,31)(2,6)(5,7)(17,20,21,27)(18,23,24,30)(19,25,26,31)(22,28,29,32)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.