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