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