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