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