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