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