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