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