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