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