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