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