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