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