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