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