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