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