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