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