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