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