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