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