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