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