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