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