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