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