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)(21,22,25,28)(23,29,31,26)(24,32,33,27)(30,34,36,35)(5,7)(6,11)(8,9)(10,12)(14,18)(19,20)(21,22,25,28)(23,29,31,26)(24,27,33,32)(30,35,36,34)(5,8,10,11)(6,12,9,7)(13,14,17,18)(15,19,16,20)(21,23,25,31)(22,26,28,29)(24,30,33,36)(27,34,32,35)(1,2)(3,4)(5,7)(6,8)(9,11)(10,12)(13,15,17,16)(14,19,18,20)(21,22)(23,26)(24,27)(25,28)(29,31)(30,34)(32,33)(35,36)(5,9,10,6)(7,8,12,11)(13,16,17,15)(14,20,18,19)(21,24)(22,27)(23,30)(25,33)(26,34)(28,32)(29,35)(31,36)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.