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