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