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