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)(21,22)(23,31)(24,27)(25,30)(26,29)(28,33)(32,36)(34,35)(6,9)(10,12)(13,14,16,17)(15,18,19,20)(22,27)(28,35)(29,30)(31,36)(2,4)(7,11)(10,12)(14,17)(18,20)(21,23,24,32)(22,28,27,35)(25,34,26,33)(29,36,30,31)(5,7,8,11)(6,10,9,12)(13,15,16,19)(14,18,17,20)(22,29)(23,32)(25,26)(27,30)(28,31)(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.