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