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