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