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)(19,22)(20,23)(21,25)(24,28)(26,30)(27,29)(31,32)(1,3,5,4,6,12,14,13)(2,7,8,11,10,16,9,15)(17,19)(18,22)(20,27)(21,26)(23,29)(24,31)(25,30)(28,32)(18,23)(20,28)(22,29)(24,25)(27,32)(30,31) involution — undirected(1,4,5,12,6,13,14,3)(2,7,9,15,10,16,8,11)(19,26)(22,30)(27,32)(29,31)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.