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)(11,13)(12,15)(14,16)(17,18,22,25)(19,20,27,23)(21,24,30,32)(26,28,29,31)(2,4)(7,8)(10,11)(14,15)(17,19)(18,23)(20,25)(21,29)(22,27)(24,28)(26,30)(31,32) involution — undirected(1,3,6,5)(2,7,4,8)(9,10,13,11)(12,14,16,15)(21,30)(24,32)(26,29)(28,31)(1,2,6,4)(3,7,5,8)(9,11,13,10)(12,15,16,14)(17,20,22,23)(18,19,25,27)(21,28,30,31)(24,26,32,29)(1,4,6,2)(3,7,5,8)(9,12,13,16)(10,14,11,15)(17,21,22,30)(18,24,25,32)(19,26,27,29)(20,28,23,31)(1,5,6,3)(2,7,4,8)(17,19)(18,20)(21,26)(22,27)(23,25)(24,28)(29,30)(31,32)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.