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