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