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