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