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