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