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