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