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