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