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