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