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