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