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