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