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