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