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