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