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