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