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