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