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