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