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