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