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