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