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