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