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)(22,27)(24,25)(28,35)(29,33)(30,36)(31,34) involution — undirected(5,7)(6,10)(8,15)(9,13)(11,19)(12,17)(14,16)(18,20)(21,22,25,27,26,29,24,33)(23,30,31,36,32,28,34,35)(2,4)(7,13)(10,17)(14,15)(18,19)(21,23)(22,28)(24,34)(25,31)(26,32)(27,35)(29,30)(33,36) involution — undirected(5,8,9,16)(6,11,12,20)(7,14,13,15)(10,18,17,19)(22,29)(27,33)(28,30)(35,36)(6,12)(10,17)(11,20)(18,19)(21,24,26,25)(22,27,29,33)(23,31,32,34)(28,36,30,35)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.