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