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