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