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