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