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