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