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