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