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