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)(17,20)(21,22,25,28)(23,29,31,26)(24,32,34,27)(30,35,33,36)(6,7)(10,11)(13,14,16,18)(15,17,19,20)(21,22)(23,26)(24,27)(25,28)(29,31)(30,35)(32,34)(33,36)(8,12)(10,11)(13,14)(15,17)(16,18)(19,20)(21,23,25,31)(22,26,28,29)(24,33,34,30)(27,36,32,35)(1,2,3,4)(5,7,9,6)(8,10,12,11)(13,15)(14,17)(16,19)(18,20)(21,22)(23,26)(24,32)(25,28)(27,34)(29,31)(30,36)(33,35)(5,8)(6,10)(7,11)(9,12)(21,24,25,34)(22,27,28,32)(23,30,31,33)(26,35,29,36)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.