One vertex per element, one color per generator, with an edge from x to x·s.
(2,5)(3,7)(9,10)(11,16)(12,21)(13,18)(14,22)(15,17)(19,24)(20,23)(25,26)(27,34)(28,30)(29,33)(31,35)(32,39)(36,40)(37,38) involution — undirected(1,2,6,5)(3,4,7,8)(9,11,15,12)(10,16,17,21)(13,22,23,19)(14,20,24,18)(25,27)(26,32)(28,36)(29,37)(30,38)(31,39)(33,40)(34,35)(1,3)(2,4)(5,8)(6,7)(10,17)(11,12)(18,20)(19,22)(25,28,31,29)(26,30,35,33)(27,36,39,37)(32,38,34,40)(1,4)(2,7)(3,5)(6,8)(9,12,15,11)(10,16,17,21)(13,22,23,19)(14,18,24,20)(25,29,31,28)(26,33,35,30)(27,37,39,36)(32,40,34,38)(1,4)(2,3)(5,7)(6,8)(9,13,15,23)(10,18,17,20)(11,19,12,22)(14,16,24,21)(25,27)(26,34)(28,36)(29,37)(30,40)(31,39)(32,35)(33,38)(1,5,6,2)(3,8,7,4)(9,14,15,24)(10,19,17,22)(11,20,12,18)(13,21,23,16)(25,30,31,33)(26,28,35,29)(27,38,39,40)(32,36,34,37)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.