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