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