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