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