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