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