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