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