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