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