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