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