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