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