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