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