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