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