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)(14,26)(15,22)(19,33)(21,28)(23,27)(25,31)(29,35)(30,36)(32,34) involution — undirected(1,2)(3,4)(5,7,10,20,11,8,22,21)(6,12,15,18,17,28,16,13)(9,19,26,34,25,23,36,35)(14,27,24,32,30,33,31,29)(2,4)(9,25)(14,30)(19,23)(24,31)(26,36)(27,33)(29,32)(34,35) involution — undirected(2,4)(5,8)(6,13)(7,11)(9,23)(10,21)(12,15)(14,29)(16,28)(17,18)(19,25)(20,22)(24,27)(26,35)(30,32)(31,33)(34,36) involution — undirected(5,9,10,26,11,25,22,36)(6,14,15,24,17,30,16,31)(7,19,20,34,8,23,21,35)(12,27,18,32,28,33,13,29)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.