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