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