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