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