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