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