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