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