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