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