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