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