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