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