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