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