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