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