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