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