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