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