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