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