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