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