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