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