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