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