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