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