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