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