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