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