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