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