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