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