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