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