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