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