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