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