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