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