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