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