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