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