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