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