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