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