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