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