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