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