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