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