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