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