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)(10,15)(11,16)(14,23)(17,26)(18,32)(19,30)(20,27)(22,29)(24,28)(25,31)(33,36)(34,35) involution — undirected(1,2)(3,4)(5,7)(6,12)(8,18)(9,17)(10,19)(11,20)(13,26)(14,25)(15,30)(16,27)(21,32)(22,33)(23,31)(24,34)(28,35)(29,36) involution — undirected(6,13)(7,17)(9,10)(14,28)(15,16)(18,31)(19,20)(21,29)(22,23)(26,30)(32,35)(33,34) involution — undirected(1,3,4,2)(5,8)(6,14)(7,18)(9,23)(10,22)(11,24)(12,25)(13,28)(15,21)(16,29)(17,31)(19,33)(20,34)(26,35)(27,36)(30,32)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.