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