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