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