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