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