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