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