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