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