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