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