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