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