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)(15,20)(16,18)(21,22,26,27)(23,28,30,36)(24,33,29,25)(31,35,34,32)(7,11)(9,12)(13,14,17,19)(15,16,20,18)(22,27)(23,30)(24,29)(32,35)(5,6,8,10)(7,9,11,12)(13,15,17,20)(14,18,19,16)(21,23)(22,28)(24,34)(25,35)(26,30)(27,36)(29,31)(32,33)(1,2,3,4)(5,6)(7,9)(8,10)(11,12)(13,15)(14,16)(17,20)(18,19)(21,24,26,29)(22,25,27,33)(23,31,30,34)(28,32,36,35)(5,7,8,11)(6,9,10,12)(13,16)(14,15)(17,18)(19,20)(21,25)(22,29)(23,32)(24,27)(26,33)(28,34)(30,35)(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.