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