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