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