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