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