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