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