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