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