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