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