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