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