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