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