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