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