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