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