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