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