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