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