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