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