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