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