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