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