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