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