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