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