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