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