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