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