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