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