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