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