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