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