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