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