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