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