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