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