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