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