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