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