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