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