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