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