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