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