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