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