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