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