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