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