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