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