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