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