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