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