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