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