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