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