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