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