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