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