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