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