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