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