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