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