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)(21,22,27,33)(23,30,24,31)(25,36,35,29)(26,34,28,32)(1,2,3,4)(5,6,8,9)(7,10,11,12)(14,17)(18,19)(21,23,26,35,27,24,28,25)(22,29,32,30,33,36,34,31)(2,4)(7,11)(10,12)(13,15)(14,18)(16,20)(17,19)(21,24,27,23)(22,30,33,31)(25,26,35,28)(29,34,36,32)(5,7,8,11)(6,10,9,12)(15,20)(18,19)(21,25,26,23,27,35,28,24)(22,31,32,29,33,30,34,36)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.