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