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