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