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