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