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