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