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