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