One vertex per element, one color per generator, with an edge from x to x·s.
(5,6,9,15,10,16,11,14)(7,17,20,12,21,28,22,18)(8,23,25,29,26,30,24,13)(19,32,34,36,35,27,33,31)(1,2)(3,4)(5,7,9,20,10,21,11,22)(6,12,14,17,16,18,15,28)(8,19,24,33,26,35,25,34)(13,27,23,31,29,32,30,36)(2,4)(5,6)(7,18)(8,13)(9,14)(10,16)(11,15)(12,21)(17,22)(19,32)(20,28)(23,24)(25,30)(26,29)(27,35)(31,34)(33,36) involution — undirected(5,8,9,24,10,26,11,25)(6,13,14,23,16,29,15,30)(7,19,20,33,21,35,22,34)(12,27,17,31,18,32,28,36)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.