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)(7,12)(8,19)(9,14)(10,11)(13,20)(15,31)(16,24)(17,27)(18,34)(21,36)(22,25)(23,30)(26,32)(28,35)(29,33)(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.