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