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