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