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