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