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