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