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