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