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