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