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