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)(7,16,19,27)(8,20)(9,14)(10,24)(11,15)(12,18,28,23)(13,21)(17,32,35,26)(22,29)(25,30)(31,33,36,34)(5,7,9,23,11,19,10,18)(6,12,14,27,15,28,24,16)(8,17,21,34,22,35,25,33)(13,26,29,36,30,32,20,31)(5,8)(6,13)(7,17)(9,21)(10,25)(11,22)(12,26)(14,29)(15,30)(16,31)(18,33)(19,35)(20,24)(23,34)(27,36)(28,32) 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.