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