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