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