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