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