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