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