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