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