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