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