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