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