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