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