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