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