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