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