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