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