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