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