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