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