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