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