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