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