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