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