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