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