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