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