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