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