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