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