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