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