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