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