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