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