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