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