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