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