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