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