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