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