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