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