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