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