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