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