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