One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,5)(4,6)(7,8)(9,10)(11,15)(12,14)(13,16) involution — undirected(1,3,5,2)(4,7,8,6)(9,11,12,16)(10,13,14,15)(17,18,21,24)(19,23,26,31)(20,22,28,25)(27,29,32,30)(10,14)(13,15)(18,22)(20,28)(23,29)(24,25)(27,32)(30,31) involution — undirected(2,3)(6,7)(11,16)(13,15)(17,19)(18,23)(20,27)(21,26)(22,29)(24,31)(25,30)(28,32) involution — undirected(1,4,5,8)(2,6,3,7)(18,24)(19,26)(22,25)(27,32)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.