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