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