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