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