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