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