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