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