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