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