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