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