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