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