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