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