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)(15,19)(18,20)(21,22,27,32)(23,30,25,28)(24,29,31,26)(33,34,35,36)(6,7)(10,11)(14,17)(18,20)(21,23,27,25)(22,28,32,30)(24,33,31,35)(26,34,29,36)(5,6,9,7)(8,11,12,10)(13,14)(15,18)(16,17)(19,20)(21,24)(22,29)(23,33)(25,35)(26,32)(27,31)(28,36)(30,34)(1,2,3,4)(5,7,9,6)(8,11,12,10)(21,25,27,23)(22,30,32,28)(24,35,31,33)(26,36,29,34)(5,8)(6,10)(7,11)(9,12)(13,15,16,19)(14,18,17,20)(21,26,27,29)(22,31,32,24)(23,34,25,36)(28,35,30,33)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.