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