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