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