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