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