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)(18,20)(21,24)(23,26)(25,30)(27,32)(28,31)(10,14)(13,16)(17,18)(19,26)(20,24)(21,30)(22,25)(23,31)(27,28)(29,32) involution — undirected(1,3,4,7)(2,6,5,8)(17,19,22,29)(18,23,25,27)(20,26,30,32)(21,31,24,28)(17,20,22,30)(18,24,25,21)(19,27,29,23)(26,28,32,31)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.