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