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