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