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