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