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