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