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