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