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