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