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