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