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