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