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