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