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