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