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