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