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