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)(7,12)(8,13)(9,17)(10,11)(14,18)(15,16)(19,20)(22,26)(23,29)(24,32)(34,36) involution — undirected(6,11)(8,12)(14,17)(16,19)(21,22,25,26)(23,30,29,27)(24,28,32,33)(31,36,35,34)(5,7,10,13)(6,12,11,8)(9,15,18,20)(14,19,17,16)(21,22)(23,27)(24,28)(25,26)(29,30)(31,34)(32,33)(35,36)(5,8,10,12)(6,13,11,7)(9,16,18,19)(14,20,17,15)(21,23,25,29)(22,27,26,30)(24,31,32,35)(28,34,33,36)(5,9)(6,14)(7,15)(8,16)(10,18)(11,17)(12,19)(13,20)(21,24)(22,28)(23,31)(25,32)(26,33)(27,34)(29,35)(30,36) involution — undirectedA 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.