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