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