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