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)(12,16)(13,21)(14,15)(17,22)(19,20)(23,24)(25,26,30,32)(27,31,34,29)(28,33,36,39)(35,37,40,38)(1,2,5,6)(3,7,8,4)(10,15)(12,18)(17,21)(20,24)(25,27)(26,31)(28,35)(29,32)(30,34)(33,37)(36,40)(38,39)(1,3)(2,4)(5,8)(6,7)(10,15)(11,16)(13,22)(20,24)(26,32)(27,34)(28,36)(37,38) involution — undirected(1,4)(2,3)(5,7)(6,8)(9,11)(10,12)(13,19)(14,16)(15,18)(17,20)(21,24)(22,23)(25,28,30,36)(26,33,32,39)(27,35,34,40)(29,38,31,37)(1,2)(3,4)(5,6)(7,8)(9,12)(10,16)(11,15)(13,20)(14,18)(17,23)(19,21)(22,24)(25,29)(26,27)(28,37)(30,31)(32,34)(33,40)(35,39)(36,38) involution — undirected(1,4)(2,3)(5,7)(6,8)(9,13)(10,17)(11,19)(12,20)(14,22)(15,21)(16,23)(18,24)(25,27)(26,29)(28,35)(30,34)(31,32)(33,38)(36,40)(37,39) involution — undirectedA 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.