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