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