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