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