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