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