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