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