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